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1 <br /> C,eo(agicaI Tec/Mics&C. <br /> ' 1101 7`h Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209) 522-4227 <br /> ' REPORT <br /> ' Groundwater Monitoring <br /> 2°d Quarter 2005 <br /> ' Marci Property <br /> 2969 Loomis Road <br /> ' Stockton, CA <br /> Project No 770 2 <br /> ' July 7, 2005 <br /> EXECUTIVE SUMMARY <br /> The site's groundwater monitoring wells ate sounded and sampled on a quarterly schedule <br /> This report summarizes the 2 d Quarter 2005 monitoring event completed on June 13, 2005 <br /> The analytical results from groundwater samples indicate that diesel range petroleum <br /> hydrocarbons (TPH-D) are present in four of the site's eleven monitoring wells Well MW-5 <br /> continues to contain elevated concentrations of TPH-D and has experienced a wide swing in <br /> diesel content over the last few events It is possible that this fluctuation is due to a change in <br /> groundwater elevation and/or poor recharge to the well with the resulting poor sample <br /> quality <br />' Depth to groundwater was measured duringry <br /> second quarter of 2005 On June 1�, 2005, the <br /> shallow aquifer flow-was S62°E with a slope of 0 008 ft/ft, and the deeper flow was N89°E <br />' with a slope of 0 001 ft/ft The vertical groundwater gradient is generally in a negative or <br /> downward direction <br />' Based on a previous consultant's data this site has a history of variable groundwater flow <br /> direction The shallow groundwater generally flows to the south-southeast wheieas the <br /> deeper aquifer generally flows to the east The gradient of the shallow aquifer has ranged <br /> from east-northeast to southwest The deeper aquifer experienced a 180° reversal of <br /> groundwater direction for the April and May 2003 sounding events and GTI's monitoring <br /> efforts confirm that groundwater direction varies from month to month at the site There are <br />